After High Sierra Update all files report "damaged and can't be opened"

I just upgraded my MacBook Pro (early 2011) w/ aftermarket SSD up to High Sierra, and then attempted to restore an account I had backup up via time machine on a machine running Sierra.

It's all been very bad so far.

On my MBPro, under the copied account, and under the existing admin account, every file I try to open throws a file corruption move to trash error. I tried to download Chrome, it tells me my DMG is corrupt, refuses to open it, wants me to trade it.

Disk utility First aid tells me everything is fine, and Repair Permissions is gone.

Any suggestions??? this is bad!

THANKS!

MacBook Pro, macOS High Sierra (10.13), SSD

Posted on Sep 29, 2017 8:11 AM

Top-ranking reply

mbbowlin

Level 1

4 points

Posted on Jan 17, 2018 6:29 PM

I found this link that fixed the issue properly.

https://macperformanceguide.com/blog/2017/20171124_1510-macOS-HighSierra-AppleCo reRot.html

The key command is below. Open Terminal and cd to the directory containing your "Damaged files"

xattr -d com.apple.quarantine *.pdf *.dmg

This fixed all my issues

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31 replies

Mar 20, 2018 7:51 AM in response to apl73

This saved me! Only thing that worked.

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After High Sierra Update all files report "damaged and can't be opened"